Illuminating appliance



Dec. 27, 1927 W0 W0 THOMPSON ILLUMINA'IING APPLIANCE Filed July 16 urn/fATTORNEY Patented Dec. 27, 1927.

uurrso STATES PATENTOFFICE.

"llflILlItlllltD 'W. THOMPSON, OF DORCHEETER, MAHSAHHUSETTS,.ASSIGIllOR, BY MESNE lltlZ'lfiTGFNIITENTQ, TO HOLOPHAJEJ'EC01VIIl?.lltNY, Illlltl, OF NEW YQRK, N. Y., A. GORPORA- fllllfllll ()1?NEW YORK.

ILLl'Ill/IIINATING APPLIANCE.

Application filed July 16, 1923. Serial No. 651,838.

The object of my invention is the con struction of an illuminatingapplial'lce prelcrably tor use in the sick room of a hospi tal. Thefixture is constructed to give a well-distributed, cheerful light ofnormal intensity, and also has a second source oiillumination of lowintensity to be used when the normal light is not desired. The unit hasa low surface brilliancy and is free from 1.0 shadows and distortionswhen either the nornull or low intensity lamps are burning.

Figure 1 is a vertical cross section otan illuminating applianceembodying the liealures Of my invention.

Figure 2 is a cross-sectional View oi the preferred :lt'orm ol thesocket cover employed in the device.

lln the :liiguro, 1 is the ampliancc, in. which 5.2 i the canopy,preferably smooth and tree from wiwolutions. 3:3 is a pipe or stem andl: is a holder l" .d directly into the stem and adapted to support aglass enclosure 5,

which. enclosure is oil? dill'using glass and preferably completelyencloses the source of illumination 6. This light source comprises apipe or stem 7 which is threaded at its upper end to the upper plpe 3 bymeans of a coupling 8 and the lower end of stem 1' is also threaded to asmooth :[laring socket on cover 9 containing receptacles for threelamps. The socket cover 9 is provided with a bottom plate lelcontainingalarge central aperture 115 and smaller apertures 16.

t locltel; corer ll is also provided with two soclret supportingbrackets 18 which. are in tea-rel. with bottom plate 14;. The upstandinf; walls of brackets TF are drilled and tapped to receive screws 1?)which act to secure the bottom plate to the socket cover.

tllcrews 17 are enu loyed to secure socket ill to the bottom plate 14;through holes 17. A

central lamp 10 of usual voltage, say of 75 watts, is fitted into thecentral receptacle l1 and two small lan'lps 12 of extremely low candlepower, for instance of 4 candle power are fitted into candelabrareceptacles 13, for purposes hereinafter described.

Attention is called to the position of the large lamp, which is soplaced that the surlace brightness oi? the enclosing globe substantiallyeven, when the large lamp 1s illuminated, while the position of the twoauxiliary lamps combined with their low intrinsic brilliancy will renderthe surface l ll of the globe dimly but evenly lit when the large lampis not in use and the small lamps are turned on.

The appliance is particularly adapted for the wards or corridors ofhospitals because the central lamp will give ample illumination for allgeneral purposes, while at night where general illumination is notrequired the small candle power lamps will indicate the position of thelight sources and furnish a guide to the attendants 01 the position ofthe objects around the room. At the same time the patients will be incon'lparative darkness and undisturbed by the artificial light when thesmall candle power lamps are burning, as the low brilliantly evenlyspread over the sin-face of the globe can be practically ignored.

7 :5 designed hitherto to serre in this dual capacity have sometimesbeen provided with a lamp which contains two filaments, but the life ol?the smaller, more delicate filament n-oportiomrtely shortened because ofits being subjectto extreme heat while the larger lamp is burning. Incases where resistance is employed to effect a dimming of the lamp otherdrawbacks are encounterod.

The appliance shown in the drawing is the result of considerable studyto meet the particular requirements. This fixture has a smooth flaringcanopy, globe holder and stem all designed to minimize the collection ofdust and to facilitate cleaning. The bot tom plate on the socket coverrenders it dustproo'l as well. The socket holder is designed to supportthe sockets and lamp in the correct position to obtain the desiredresults in distrllnltion and intensity. The low inten' sity lamps arelocated in the socket holder which. is constructeiil to eliminateshadows or distortion from the globe when the normal or low intensitylights are illuminated. Although the secondary sources are in theposition shown the various light rays appear to come from a singlesource inside the globe.

It will be noted that the diffusing globe extends above and below thelamp, that it is of the shape to direct lightboth upwardly anddownwardly so as to illuminate the entire room, and that no shadows willbe produced on the ceiling.

I claim:

1. A lighting fixture comprising a canopy,

Elli

with a smooth extension stem the globe and fitted with a smooth socketcover constructed to contain a plurality of receptacles and adapted tocontain lamps of various sizes to secure even illumination of differentdegrees and substantially even sur face brightness when the diil'oreutlamps are illuminated, the dill'using globe extending above and belowthe lamps so as to direct light upwardly and downwardly.

Signed at Boston, in the county ol? Suffolk and State oflllassachusctts, this 13th day of July, 1923.

\VILLARD \V. THOMPSON.

extending into

